CN109439915B - Method for online treatment of zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and application of method - Google Patents

Method for online treatment of zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and application of method Download PDF

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CN109439915B
CN109439915B CN201811079511.1A CN201811079511A CN109439915B CN 109439915 B CN109439915 B CN 109439915B CN 201811079511 A CN201811079511 A CN 201811079511A CN 109439915 B CN109439915 B CN 109439915B
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slag
zinc
containing dust
blast furnace
dust
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CN109439915A (en
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赵凯
韩伟刚
师学峰
张巧荣
张玉柱
邢宏伟
胡长庆
龙跃
白丽梅
王彬
魏志芳
张遵乾
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North China University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/10—Slag pots; Slag cars
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/34—Obtaining zinc oxide
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Glass Compositions (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a method for on-line processing zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and application thereof, wherein a slag tank with a rectangular cross section is used as a reaction device, the zinc-containing dust is sprayed into the blast furnace slag in the slag tank by a spray gun, simultaneously, a proper amount of high-pressure oxygen is sprayed from two side surfaces of the slag tank in the height direction by the spray gun to perform combustion reaction with carbon in the zinc-containing dust, and a large amount of bubbles are generated to strongly stir the slag while releasing heat.

Description

Method for online treatment of zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and application of method
The technical field is as follows:
a method for on-line processing zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and an application thereof belong to the technical field of metallurgical engineering.
Background art:
the blast furnace slag is a main byproduct in the steel smelting process, 300-350 kg of blast furnace slag can be produced when 1 ton of pig iron is produced, the slag discharging temperature reaches more than 1400 ℃, and each ton of slag contains heat equivalent to 60kg of standard coal. At present, hot melt slag is mainly granulated by direct water quenching in China and is used for producing cement and concrete; secondly, slag aggregate is produced, or expanded beads and slag wool are produced through the processes of remelting and the like, so that the heat of 60kg of standard coal/t slag contained in the hot blast furnace slag is greatly dissipated, most production enterprises adopt a cupola or an electric furnace to carry out secondary melting on the cooled slag, and then adopt a multi-roller centrifugal blowing method to prepare the mineral wool fiber. However, the cupola process requires a large amount of coke and has large pollutant discharge; the electric furnace needs a large amount of electric energy for melting the solid blast furnace slag, the size of the furnace cannot be increased along with the increase of the energy production, otherwise, the time is too long and the energy consumption is too high due to the serious restriction of the size of the furnace after the slag melting and tempering processes in the furnace.
In addition, about 20kg of furnace dust is carried out per ton of pig iron in the production process of the blast furnace, wherein a large amount of compound zinc is contained, at present, a rotary hearth furnace is mostly adopted for direct reduction treatment to produce metallized pellets, zinc ash containing 40-50% of zinc oxide grade is recovered, and 1200m of converter gas is consumed3-1300m3。
The invention mainly solves the problems and provides the slag pot with the bottom spray gun and the side spray gun, wherein the zinc-containing dust is reduced by utilizing the sensible heat of the blast furnace slag discharged from the furnace, iron and zinc are recovered, and other substances enter the blast furnace slag; at the same time, the blast furnace slag is strongly stirred by utilizing the spray gun, so that the quenching and tempering speed and the uniformity are improved, the quenched and tempered blast furnace slag is directly used as a raw material for producing the mineral cotton fiber, the method can be used for treating the zinc-containing dust and producing the mineral cotton fiber at the same time, and compared with the prior treatment process, the method can save 60kg of standard coal/t slag and 1200m of converter gas3-1300m3。
The invention content is as follows:
the invention aims to solve one of the technical problems, and provides a method for online treating zinc-containing dust by using blast furnace slag and an application thereof, wherein the technical scheme of the invention is as follows:
a method for on-line processing zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag adopts a slag tank with a rectangular cross section as a reaction device, sprays the zinc-containing dust into blast furnace slag in the slag tank from the bottom of the slag tank by adopting a spray gun, simultaneously sprays high-pressure oxygen from two opposite side surfaces of the slag tank by the spray gun, controls the molar ratio of the oxygen to the carbon content in the zinc-containing dust to be more than 1, performs combustion reaction with the carbon in the zinc-containing dust, and generates a large amount of bubbles to intensively stir the slag while releasing heat.
The slag pot is provided with a heat-insulating cover, the heat-insulating cover is provided with a slag leading-in pipe and a flue gas leading-out pipe, the bottom of the heat-insulating cover is provided with spray guns, and the number of the spray guns is more than 2.
Two opposite side surfaces of the rectangular slag pot are respectively provided with a row of air ports, and the number of the air ports is more than 2.
The zinc-containing dust is cloth bag ash obtained by dry dedusting, and SiO in the cloth bag ash2、Al2O3The mass percentages of the contents of the four oxides of CaO and MgO meet the following requirements: (SiO)2％+Al2O3% CaO + MgO% is greater than 1, the amount of the zinc-containing dust with particle size less than 200 mesh is greater than 85%, and C% is greater than 20%.
In one application of the method, the slag flowing out of the blast furnace taphole is first directly introduced into the slag tank, and then the bottom lance and the side lances are simultaneously started.
The bottom spray gun sprays zinc-containing dust into the slag by adopting air, the number of the spray guns is the same as that of air ports on one side surface of the rectangular slag tank, the center of the bottom spray gun and the center of the air ports on the side surface are on the same straight line, and the side spray gun sprays pure oxygen.
The zinc in the zinc-containing dust is reduced by carbon in the dust in the slag, and then escapes from the slag along with the smoke and dust generated after combustion, and is guided into a dust remover through a smoke guide pipe positioned at the top of a heat-insulating cover of a rectangular slag pot to carry out gas-powder separation to form rich slagZnO zinc ash and separated flue gas are used as drying heat sources of other procedures. The iron oxide containing zinc dust is reduced and then is collected at the bottom of the slag pot, and SiO is generated2The oxides of CaO and MgO are melted in the high-temperature slag, and the formed new slag is used as a raw material for preparing the mineral wool fiber.
SiO carried by zinc-containing dust2CaO, MgO content and SiO in high-temperature slag2The sum of the contents of CaO and MgO must satisfy the following requirements in percentage: (SiO)2％+Al2O3%)/(CaO% + MgO%) is greater than 1 and S% is less than 0.5%.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic view of the rectangular slag pot of the present invention.
FIG. 3 is a side tuyere arrangement view of a rectangular slag pot of the present invention.
FIG. 4 is a view of the bottom lance position arrangement of the present invention.
Wherein, 1 high-temperature slag inlet, 2 high-temperature flue gas outlets, 3 air ports, 4 rectangular slag pot heat preservation covers, 5 iron outlets, 6 rectangular slag pots and 7 bottom spray guns.
Example 1
A method for processing zinc-containing dust on line by utilizing sensible heat of blast furnace high-temperature slag and application thereof are disclosed, wherein a slag tank (6) with a rectangular cross section is used as a reaction device, the high-temperature slag flowing out of a blast furnace taphole is guided into the slag tank (6) through a high-temperature slag inlet (1), a bottom spray gun (7) is started to spray the zinc-containing dust into the blast furnace slag in the slag tank (6), a proper amount of high-pressure oxygen is sprayed from two side surfaces of the slag tank (6) in the height direction through a spray gun (3) to perform combustion reaction with carbon in the zinc-containing dust, a large number of bubbles are generated to strongly stir the slag while releasing heat, the flue gas and the dust escaping from the high-temperature slag escape through a high-temperature flue gas outlet (2) and enter a subsequent dust remover to perform gas-powder separation, ZnO-rich zinc ash is formed, and the separated flue. After iron oxide in the zinc-containing dust is reduced by carbon, the iron oxide is gathered at the bottom of the slag pot and then flows out from the tapping hole (5) respectively with high-temperature slag.
2. Two side surfaces of the rectangular slag pot in the height direction are respectively provided with a row of air outlets, and the number of the air outlets is 3.
3. The zinc-containing dust is cloth bag ash obtained by dry dedusting, and SiO in the cloth bag ash2、Al2O3The mass percentages of the contents of the four oxides of CaO and MgO meet the following requirements: (SiO)2％+Al2O3(%)/(CaO% + MgO%)/(1.4), the amount of particles having a particle size of less than 200 mesh was more than 85%, and C% was more than 20%.
4. SiO carried by zinc-containing dust2CaO, MgO content and SiO in high-temperature slag2The sum of the contents of CaO and MgO must satisfy the following requirements in percentage: (SiO)2％+Al2O3%)/(CaO% + MgO%) (1.2, S% was less than 0.5%.
The method can be used for simultaneously treating zinc-containing dust and producing mineral cotton fibers, and can save standard coal/t slag and converter gas of 60kg by 1200m compared with the prior treatment process3-1300m3. The economic benefit of the produced slag wool fiber is separately accounted according to the market price. It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (5)

1. A method for on-line processing zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag is characterized in that a slag tank with a rectangular cross section is used as a reaction device, the zinc-containing dust is sprayed into blast furnace slag in the slag tank from the bottom of the slag tank by a spray gun, high-pressure oxygen is sprayed from two opposite side surfaces of the slag tank by the spray gun, the molar ratio of the oxygen to the carbon content in the zinc-containing dust is controlled to be more than 1, the oxygen and the carbon in the zinc-containing dust are subjected to combustion reaction, a large amount of bubbles are generated to intensively stir the slag while releasing heat,
the slag pot is provided with a heat preservation cover, the heat preservation cover is provided with a slag leading-in pipe and a flue gas leading-out pipe, the bottom is provided with spray guns, the number of the spray guns is more than 2,
two opposite side surfaces of the rectangular slag pot are respectively provided with a row of air ports, the number of the air ports is more than 2,
the zinc-containing dust is cloth bag ash obtained by dry dedusting, and SiO in the cloth bag ash2、Al2O3The mass percentages of the contents of the four oxides of CaO and MgO meet the following requirements: (SiO)2％+Al2O3% CaO + MgO% is greater than 1, the amount of the zinc-containing dust with particle size less than 200 mesh is greater than 85%, and C% is greater than 20%.
2. The method for the on-line treatment of the zinc-containing dust by utilizing the sensible heat of the blast furnace high-temperature slag according to claim 1, characterized in that: firstly, directly guiding the molten slag flowing out of a blast furnace taphole into a slag tank, and then simultaneously starting a bottom spray gun and a side spray gun.
3. The method for on-line treatment of zinc-containing dust by using sensible heat of blast furnace high-temperature slag according to claim 2, wherein: the bottom spray gun sprays zinc-containing dust into the slag by adopting air, the number of the spray guns is the same as that of air ports on one side surface of the rectangular slag tank, the center of the bottom spray gun and the center of the air ports on the side surface are on the same straight line, and the side spray gun sprays pure oxygen.
4. The method for on-line treatment of zinc-containing dust by using sensible heat of blast furnace high-temperature slag according to claim 2, wherein: zinc in the zinc-containing dust is reduced by carbon in the dust in the slag, and then escapes from the slag along with smoke and dust generated after combustion, the smoke and the dust are led into a dust remover through a smoke outlet pipe positioned at the top of a heat-insulating cover of a rectangular slag pot to carry out gas-powder separation to form ZnO-rich zinc ash, the separated smoke is used as a drying heat source of other working procedures, iron oxide containing the zinc-containing dust is reduced and then collected at the bottom of the slag pot, and SiO is collected at the bottom of the slag pot2The oxides of CaO and MgO are melted in the high-temperature slag, and the formed new slag is used as a raw material for preparing the mineral wool fiber.
5. The method for on-line treatment of zinc-containing dust by using sensible heat of blast furnace high-temperature slag according to claim 2, wherein: SiO carried by zinc-containing dust2CaO, MgO content and SiO in high-temperature slag2The sum of the contents of CaO and MgO must satisfy the following requirements in percentage: (SiO)2％+Al2O3%)/(CaO% + MgO%) is greater than 1 and S% is less than 0.5%.
CN201811079511.1A 2018-09-17 2018-09-17 Method for online treatment of zinc-containing dust by utilizing sensible heat of blast furnace high-temperature slag and application of method Active CN109439915B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001049361A (en) * 1999-03-30 2001-02-20 Nkk Corp Method for recovering zinc in dust
CN101445848A (en) * 2008-12-22 2009-06-03 莱芜钢铁集团有限公司 Process and device for continuous steelmaking from ferriferous material
CN101476003A (en) * 2009-02-06 2009-07-08 杨子毅 Alkali blast furnace blowing coal based direct reducer and production method thereof
CN201440037U (en) * 2009-08-24 2010-04-21 中国恩菲工程技术有限公司 Device for recovering valuable metal from zincy slag
CN104878215A (en) * 2015-04-21 2015-09-02 云南驰宏锌锗股份有限公司 Method for processing wet zinc residues by utilizing oxygen-enriched top-blowing lead smelting furnace
CN105838876A (en) * 2016-05-10 2016-08-10 北京科技大学 Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat
CN107674985A (en) * 2017-10-10 2018-02-09 东北大学 By the method for zinc abstraction slag recovery valuable component

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001049361A (en) * 1999-03-30 2001-02-20 Nkk Corp Method for recovering zinc in dust
CN101445848A (en) * 2008-12-22 2009-06-03 莱芜钢铁集团有限公司 Process and device for continuous steelmaking from ferriferous material
CN101476003A (en) * 2009-02-06 2009-07-08 杨子毅 Alkali blast furnace blowing coal based direct reducer and production method thereof
CN201440037U (en) * 2009-08-24 2010-04-21 中国恩菲工程技术有限公司 Device for recovering valuable metal from zincy slag
CN104878215A (en) * 2015-04-21 2015-09-02 云南驰宏锌锗股份有限公司 Method for processing wet zinc residues by utilizing oxygen-enriched top-blowing lead smelting furnace
CN105838876A (en) * 2016-05-10 2016-08-10 北京科技大学 Method for recovering and treating zinc-containing dust through blast furnace slag sensible heat
CN107674985A (en) * 2017-10-10 2018-02-09 东北大学 By the method for zinc abstraction slag recovery valuable component

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Application publication date: 20190308

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Denomination of invention: A Method and Application of Utilizing High Temperature Slag of Blast Furnace for Sensible Heat Online Treatment of Zinc Containing Dust

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